Overview

When you upgrade to a newer version of cPanel & WHM or install cPanel & WHM on a new server, cPanel & WHM checks your system for compatibility with the version of cPanel & WHM that you wish to install.

What is a blocker?

Blockers are conditions that do not allow the cPanel & WHM update process (upcp) to install a particular version.

Upgrades that include multiple major versions

If you run an update that includes multiple major version upgrades of cPanel & WHM, the cPanel & WHM update process (upcp) will upgrade your server to each intermediate version. The update process performs compatibility checks for each intermediate version prior to the upgrade to that version.

For example, after a system administrator runs an update on a server that runs cPanel & WHM version 11.50, and the target version is cPanel & WHM version 56, the cPanel & WHM update process (upcp) performs the following actions:

The update process detects that the system must first upgrade to cPanel & WHM version 11.52.

The update process performs compatibility checks for the upgrade to cPanel & WHM version 11.52.

If the system is compatible, the update process upgrades cPanel & WHM to version 11.52.

If the system is not compatible, the update process sends a list of the compatibility issues to the system administrator, and the server remains on cPanel & WHM version 11.50.

After the upgrade to version 11.52 is complete, the update process performs compatibility checks for the upgrade to cPanel & WHM version 54.

If the system is compatible, the update process upgrades cPanel & WHM to version 54.

If the system is not compatible, the update process sends a list of the compatibility issues to the system administrator, and the server remains on cPanel & WHM version 11.52.

After the upgrade to version 54 is complete, the update process performs compatibility checks for the upgrade to cPanel & WHM version 56.

If the system is compatible, the update process upgrades cPanel & WHM to version 56.

If the system is not compatible, the update process sends a list of the compatibility issues to the system administrator, and the server remains on cPanel & WHM version 54.

System and software checks

The cPanel & WHM update and installation process performs two types of checks:

Standard — Standard checks apply to all installations and upgrades.

Version-specific — Version-specific checks are requirements that are specific to the version of cPanel & WHM to which you begin an installation or upgrade.

If cPanel & WHM encounters a compatibility issue that blocks the installation or upgrade process, the following events happen:

If you started an upgrade, the system remains at the last known compatible version. If you started a new installation of cPanel & WHM, the system remains in its pre-installation status.

cPanel & WHM sends a list of the blockers to the system administrator.

The installation or upgrade process exits.

Warning:

As of cPanel & WHM version 11.34, after you upgrade to a new major version of cPanel & WHM, you cannot downgrade to a previous major version.

Note:

Before you upgrade the version of cPanel & WHM on a server, we strongly recommend that you restore cPanel & WHM's management of all FTP targets on your server. If the FTP RPM's target is set to unmanaged on a server that you wish to upgrade, you may encounter problems in the cPanel user interface.

Standard checks for all upgrades

When you run an upgrade of cPanel & WHM to any version, the update process performs the following standard checks:

License files

You cannot upgrade cPanel & WHM if any of the following conditions are true:

The cPanel & WHM update process cannot find a valid cPanel & WHM license file. Without the license file, cPanel & WHM cannot function properly and will block all updates. You must purchase a valid license in order to upgrade, downgrade, or use cPanel & WHM.

RPM database integrity

As of cPanel & WHM version 11.36, the update process verifies the integrity of the RPM database. To verify the integrity of the RPM database, the update process installs and uninstalls a test RPM. The update process attempts to repair the problem, but if it cannot repair the RPM database, the upgrade attempt fails.

The /var/cpanel/sysinfo.config file must exist and must contain entries. For more information on the /var/cpanel/sysinfo.config file, read the sysinfo.config section below.

FreeBSD®

CentOS 3 or earlier

Red Hat 3 or earlier

The mbox mail storage system

Exim 4.0 or earlier

The /var/cpanel/sysinfo.config file is empty or does not exist.

11.34

CentOS 5 or newer, CloudLinux™ 5 or newer, or RHEL 5 or newer

MySQL® 5.0 or newer

CentOS 4 or earlier, CloudLinux 4 or earlier or RHEL 4 or earlier

MySQL 4.x or earlier

11.36

At least 1.6 GB of space available in the /usr/local/cpanel/ directory

cPanel package updates set to Automatic or Inherit. For more information on how to set the cPanel package updates to Automatic or Inherit, read the cPanel package updates section below.

Note:

When you upgrade to cPanel & WHM version 11.36, the cPanel & WHM update process may rebuild your Exim configuration. We recommend that you check your Exim configuration after you upgrade to cPanel & WHM version 11.36.

Less than 1.6 GB available in the /usr/local/cpanel directory.

The /usr/local/cpanel/scripts/sysup script is disabled.

Third-party packages are disabled.

11.38

None

Interchange is enabled.

11.40

None

None

11.42

None

None

11.44

None

None

11.46

None

Microsoft® FrontPage® Extensions

The cpanel-php53 RPM target is set to installed.

11.48

None

None

11.50

New installations on CentOS 7 servers require at least 1 GB of RAM, and are only available for 64-bit systems.

None

11.52

New installations on CloudLinux and RHEL 7 servers require at least 1 GB of RAM, and are only available for 64-bit systems.

New installations on Amazon Linux are only available for 64-bit systems.

None

54

None

None

56

None

None

58

Only available for 64-bit systems.

CentOS 5, RHEL 5, and CloudLinux 5.

32-bit systems.

The perl514 RPM target is set to installed or unmanaged.

60

SNI support

Apache (httpd) 2.2.11 or older

62

MySQL® version 5.5 and later.

MySQL version 5.1 and earlier.

64

None

None

Additional blocker information

cPanel & WHM version 11.32

sysinfo.config

cPanel & WHM automatically attempts to run the/usr/local/cpanel/scripts/gensysinfo script to generate this file during the upgrade procedure. If you encounter this error, perform the following steps:

Run the /usr/local/cpanel/scripts/gensysinfo script.

Examine the /var/cpanel/sysinfo.config file.

Correct any file permission problems or similar issues that prevent the root user's write privileges.

cPanel & WHM version 11.36

Disk space on all cPanel version changes and new installs

As of cPanel & WHM version 11.36, to ensure that a partial upgrade does not break your current installation, the cPanel & WHM update process downloads new files to a staging directory inside the /usr/local/cpanel/ directory.

To ensure that there is enough disk space available for the new files, the cPanel update process checks for a minimum of 1.6GB of available disk space in the /usr/local/cpanel/ directory before an upgrade, update, or new installation can begin. After the cPanel & WHM update process downloads the files and completes the compatibility checks, the update process replaces the prior version of each file with the new version.

Note:

cPanel & WHM checks for the amount of available disk space in the /usr/local/cpanel/ directory, but some legacy RPMs (for example, Exim or MySQL) install outside that space. We do not check for sufficient disk space in the /usr/ directory if it is in a different partition from the /usr/local/cpanel/ directory.

cPanel package updates set to Automatic or Inherit

To update to cPanel & WHM version 11.36, the following cPanel package updates must be set to Automatic or Inherit:

If you set the EXIMUP key's value to inherit in the /etc/cpupdate.conf file, you may receive an error that informs you that the EXIMUP key's value is set to never. To resolve this issue, perform the following steps:

Set the CPANEL key's value to 11.36 in the /etc/cpupdate.conf file.

Run the cPanel & WHM update process.

Set the CPANEL key's value to your desired support tier (for example, RELEASE) in the /etc/cpupdate.conf file.

cPanel & WHM version 11.50

New installations on CentOS 7 servers

New installations on CentOS 7 servers require a minimum of 1 GB of RAM, and are only available for 64-bit systems.

cPanel & WHM version 11.52

New installations on CloudLinux and RHEL 7, and Amazon Linux servers

New installations on CloudLinux and RHEL 7 servers require a minimum of 1 GB of RAM, and are only available for 64-bit systems.

New installations on Amazon Linux are only available for 64-bit systems.

cPanel & WHM version 58

64-bit systems only

cPanel & WHM version 58 is only available for 64-bit systems. You cannot install or upgrade to cPanel & WHM version 58 on a 32-bit system.

CentOS, RHEL, and CloudLinux systems require version 6 or later

If your server runs the CentOS, RHEL, or CloudLinux operating systems, it must run version 6 or later. You cannot install or upgrade to cPanel & WHM version 58 on a server that runs CentOS 5, RHEL 5, or CloudLinux version 5.

The perl514 RPM target is set to installed or unmanaged

If the perl514 RPM target's state is installed or unmanaged in any.versions file in the /var/cpanel/rpm.versions.d/ directory, the upgrade to cPanel & WHM version 58 will fail.

cPanel & WHM version 62

MySQL upgrade required

cPanel & WHM version 62 requires that your server runs MySQL version 5.1 or earlier. You must upgrade your MySQL version to at least MySQL version 5.5 before you can upgrade your cPanel & WHM server. You can upgrade your MySQL version in WHM's MySQL or MariaDB Upgrade interface (Home >> Software >> MariaDB/MySQL Upgrade).

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